in most hosting platforms we have the control panel console to add cron tabs. But in the case of our local linux machine, or server's which does not have control panel, we could use the following

adding the commands in the crontab

Login in the console as super user

Use the following command " sudo crontab -e " to open the crontab file. Some times you will get a message to select the editor to open the file. select the desired editor. the crontab file will open and it contains the syntax for the crontab command. its looks like " # m h dom mon dow command "